Haha it's all good cuz if you mess up you peel it off and start it over
I bought about 6 cans from home depot (they come in aerosol cans about 5.98 a can) then if your gonna do wheels I recommend taking them off the car because you don't want the dip to get in the brakes. Shake the can well and about 6-10 inches away start spraying in nice even strokes, it kinda works itself out because each layer settles into the last layer you put on. I did 6 layers on each rim
Hope this helps! If you got any questions I'll be glad to help
Just read your in Canada so the price might be a lil higher.